We report, for the first time, operation frequency dependence of current density-voltage (J<sub>OLED</sub>-V<sub>OLED</sub>) shift for multi-layer organic light-emitting diodes (OLEDs). When the OLEDs were electrically stressed for 21 hours with 50% duty voltage pulses at 60, 120, 240, and 360 Hz, the JOLED-VOLED shifts were suppressed by half for 360 Hz operation compared with 60 Hz operation, but with little change in emission efficiencies. This frequency dependent J<sub>OLED</sub>-V<sub>OLED</sub> shift is believed to be commonly observed for typical multi-layer OLEDs and can be used to further improve lifetime of digitally-driven active-matrix OLED displays.

© 2012 Optical Society of Korea

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